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| Registros recuperados: 10 | |
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| Miranda,Raiane F.; Alves Júnior,José; Casaroli,Derblai; Evangelista,Adão W. P.; Batisti,Rafael. |
| ABSTRACT The answers to when and how much to irrigate orchards can be obtained based on the measurements of plants' transpiration and leaf temperature. This study aims to determine the leaf temperature and sap flow of the pequi tree (Caryocar brasiliense Camb.), both with and without water restriction. Further, the leaf temperature was measured by infrared thermometry and estimated transpiration using the Granier method, where the thermal dissipation probes are inserted into the plant stems. The experiment was conducted in a 120-plant orchard located in Goiânia-GO, Brazil, from which seven of the plants (3 irrigated and 4 non-irrigated; aged 6.6–7.4 years) were evaluated for eight months (October 2015 to May 2016). The soil was characterized as a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Caryocar brasiliense Camb.; Water requirement; Water deficit; Brazilian Savannah. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000500579 |
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| SILVA, M. A. da; CHOUDHURY, E. N.; GUROVICH, L. A.; MILLAR, A. A.. |
| Estudos realizados dao como potencial irrigavel para a regiao do Vale do Sao Francisco cerca de 800.000 ha, levando-se em conta nao somente o fator classe de solo, mas, tambem os recursos hidricos disponiveis. Por problemas hidraulicos e operacionais esses projetos de irrigacao deverao ser operados sob um conjunto de normas pre-estabelecidas do ponto de vista agricola e operacional visando o uso de racionalizacao dosseguintes aspectos: turno de rega para a distribuicao de agua as parcelas, ao longo do periodo de desenvolvimento de cada cultura; lamina de agua aplicada fixa, ao longo do periodo de desenvolvimento da cultura; metodos de irrigacao de alta eficiencia, de aplicacao e operacao faceis e economicos. Estas normas tem por objetivo utilizar... |
| Tipo: Parte de livro |
Palavras-chave: Necessidade; Agricultura irrigada; Irrigação; Água; Método; Agriculture; Irrigation; Water requirement. |
| Ano: 1981 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/133327 |
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| Santos,Célia S. dos; Montenegro,Abelardo A. de A.; Santos,Márcio A. L. dos; Pedrosa,Elvira M. R.. |
| ABSTRACT Efficient water use in agriculture is fundamental, especially in semi-arid regions where water scarcity is intense. The aim of this study was to estimate water requirements and crop coefficients in the different phenological stages of Moringa oleifera. The experiment was carried out from February to April 2015 at the Experimental Unit for Reuse and Hydrological Management, located in Mutuca, PE (7º 15’ 18’’ S, 35º 52’’ 40’’ W, 550 m). A lysimeter was used to estimate crop evapotranspiration. Reference evapotranspiration (ETo) was estimated by indirect methods. In the lysimeter, soil salinity and leaf water potential of the crop were monitored. The direct and indirect methods presented an excellent performance compared with the standard... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Irrigation management; Water requirement; Perennial oilseed crop. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001200840 |
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| Azevedo,Benito M. de; Vasconcelos,Denise V.; Bomfim,Guilherme V. do; Viana,Thales V. de A.; Nascimento Neto,Joaquim R. do; Oliveira,Kárcia M. A. S. de. |
| ABSTRACT Local information about irrigation depths for sunflower can be used in the design of projects and irrigation management to increase crop yield and to reduce costs. This study aimed to evaluate the effects of irrigation depths on sunflower and calculate its yield response factor. The experiment was conducted in Fortaleza-CE, Brazil, in a randomized block design, with six treatments, four replicates and ten evaluated plants per plot. The treatments were applied in the phenological stages II, III and IV with irrigation depths equivalent to 25, 50, 75, 100, 125 and 150% of crop evapotranspiration. The yield response factor was calculated according to FAO Bulletin nº 33. The water supply, equivalent to 79.7 and 91.1% of crop evapotranspiration,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Helianthus annuus; Water requirement; Drip irrigation. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000500427 |
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| Araújo,Mário S. P. de; Sousa,Elias F. de; Pereira,Vinícius R.; Ferreira,Fernando H. A.; Carvalho,Daniel F. de. |
| ABSTRACT This study was carried out to determine the evapotranspiration (ETc) and crop coefficients (Kc) for four stages of “Caatingueiro” corn under the climate condition of Seropédica, RJ, Brazil, using weighing lysimeters. The field trial occurred in 2015, from March 18 to June 25, in two areas cultivated with “Caatingueiro’ corn intercropped with jack bean and in monoculture. The reference evapotranspiration (ETo) was estimated by the FAO-56 Penman-Monteith model and the Kc values were determined by the ratio between ETc and ETo. The Kc values obtained for the intercropping and monoculture systems, were respectively: 0.78 (I); 1.01 (II); 1.10 (III) and 1.01 (IV), and 0.62 (I); 0.92 (II); 1.27 (III) and 0.81 (IV), and they were different from the values... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water requirement; Weighing lysimeter; Irrigation; Organic cultivation. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000100027 |
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| Carvalho,Daniel F. de; Ribeiro,Eduardo C.; Gomes,Daniela P.. |
| ABSTRACT The objectives of this study were to obtain the onion crop coefficients and evaluate the influence of different irrigation depths (0, 22, 45, 75 and 100% of crop evapotranspiration) on marketable yield and quality of onion bulbs cultivated with and without mulch of elephant grass. The experiment was carried out in Seropédica, RJ, Brazil, from May to September 2012, in a Red Yellow Argisol. The experimental design was in randomized blocks in split plots, with 10 treatments and seven replicates. Irrigation management was performed through soil water balance using the Time Domain Reflectometry technique, with probes installed horizontally at 7.5 and 22.5 cm depths. The use of mulch allowed the application of smaller irrigation depths, leading to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crop coefficient; Water requirement; Allium cepa L.; Vegetable grass residues. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000200107 |
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| Fronza,Diniz; Folegatti,Marcos Vinícius. |
| The knowledge of water requirement of crops in the different growing phases elicits higher crop yield and rational use of water resource. The aim of this work was to estimate the water consumption of stevia using two constant watertable microlysimeters. The research was conducted in San Piero a Grado, Pisa, Italy. The data were collected daily from June, 1st, to October, 22th, 2000. Reference evapotranspiration was determined by the Penman-Monteith-FAO method, in the same period. Microlysimeters watertables level were maintained at the 35 cm depth. Crop evapotranspiration for the total cicle (80 days) was 464 mm. For the most water consuming phase, crop average evapotranspiration was 5.44 mm day-1. The crop coefficient values were 1.45 for the first 25... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Lysimeter; Water requirement; Evapotranspiration. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300028 |
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| Registros recuperados: 10 | |
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